surging

So, my 2019 X739 has been flawless since new. A hair over 100 hours on the clock. Today as I finished up mowing, I noticed that it wasn't smooth at full speed as I drove back to the barn. Played with it a little and noticed a strong skip and RPMs wouldn't go to full on the gauge. Drove it into...

In 2023 I bought a used 2009 Craftsman PYT9000 that has a B&S 24 hp 44M777 TYPE 0790 B1 CODE 091219YG. Ran great for 1.5 years. A few weeks ago, I started getting surging issues. From a cold start, it will run fine for about 20 minutes, then starts surging so bad that it shuts down. I have so...